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Journal articles
Open Access
The SEI facility for fluid-bed wood gasification, TAPPI JOURNAL September 1989

The SEI facility for fluid-bed wood gasification, TAPPI JOURNAL September 1989

Journal articles
Open Access
Using bacteriophage for slime control in the paper mill, TAPPI JOURNAL, August 1990, Vol. 73(8)

Using bacteriophage for slime control in the paper mill, TAPPI JOURNAL, August 1990, Vol. 73(8)

Journal articles
Open Access
Chlorinated organic matter in bleached chemical pulp production part 6: chlorinated compounds in effluents, TAPPI JOURNAL, January 1990, Vol. 73(1)

Chlorinated organic matter in bleached chemical pulp production part 6: chlorinated compounds in effluents, TAPPI JOURNAL, January 1990, Vol. 73(1)

Journal articles
Open Access
The effect of brownstock washing on the formation of chlorinated dioxins and furans during bleaching, TAPPI JOURNAL, January 1990, Vol. 73(1)

The effect of brownstock washing on the formation of chlorinated dioxins and furans during bleaching, TAPPI JOURNAL, January 1990, Vol. 73(1)

Journal articles
Open Access
Polymers, laminations and coatings conference, TAPPI JOURNAL, January 1990, Vol. 73(1)

Polymers, laminations and coatings conference, TAPPI JOURNAL, January 1990, Vol. 73(1)

Journal articles
Open Access
Washington state's continuous emissions monitoring system (cems) experience and enforcement guidance, TAPPI JOURNAL, July 1990, Vol. 73(7)

Washington state's continuous emissions monitoring system (cems) experience and enforcement guidance, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
Maintenance of medium-voltage vacuum circuit breakers, TAPPI JOURNAL, March 1990, Vol. 73(3)

Maintenance of medium-voltage vacuum circuit breakers, TAPPI JOURNAL, March 1990, Vol. 73(3)

Journal articles
Open Access
Practical aspects of alkaline sizing - on kinetics of alkyl ketene dimer reactions: hydrolysis of alkyl ketene dimer, TAPPI JOURNAL, November 1990, Vol. 73(11)

Practical aspects of alkaline sizing - on kinetics of alkyl ketene dimer reactions: hydrolysis of alkyl ketene dimer, TAPPI JOURNAL, November 1990, Vol. 73(11)

Journal articles
Magazine articles
Characterizing rheological behavior and fluidization of highly refined furnishes, TAPPI Journal April 2024

ABSTRACT: In this work, highly refined softwood bleached kraft pulp (SWBKP) furnishes, referred to here as XFC, were studied from the perspective of fiber suspension handling in processing. The rheology of the furnishes was studied with a rotational rheometer using a non-standard flow geometry to understand the viscosity development at different consistencies and the impact of temperature. For fluidization analysis during pipe flow, two optical methods were implemented; namely, optical coherence tomography (OCT) and high-speed video (HSV) imaging. The OCT was used to determine the small-scale floc structures near the pipe wall where the shear stress is highest, and the HSV imaging was applied for observing flow instabilities and XFC suspension uniformity at the pipe scale. All these issues can be significant in deciding the minimum flow rate required for a process pipe to get sufficient fluidization of XFC suspensions.

Journal articles
Magazine articles
Open Access
Dynamic out-of-plane compression of paperboard — Influence of impact velocity on the surface, TAPPI Journal February 2024

ABSTRACT: Processes that convert paperboard into finished products include, for example, printing, where the paperboard is subjected to rapid Z-directional (ZD) compression in the print nip. However, measuring and evaluating the relevant properties in the thickness direction of paperboard are not necessarily straightforward or easy. Measuring at relevant, millisecond deformation rates further complicates the problem. The aim of the present work is to elucidate some of the influences on the compressive stiffness. Both the initial material response and the overall compressibility of the paperboard is studied. In this project, the effect on the material response from the surface structure and the millisecond timescale recovery is explored.The method utilized is a machine called the Rapid ZD-tester. The device drops a probe in freefall on the substrate and records the probe position, thus acquiring the deformation of the substrate. The probe is also allowed to bounce several times on the surface for consecutive impacts before being lifted for the next drop. To investigate the time dependent stiffness behavior, the probe is dropped several times at the same XY position on the paperboard from different heights, thus achieving different impact velocities. The material response from drops and bounces combined allows study of the short-term recovery of the material. The material in the study is commercial paperboard. The paperboard samples are compared to material where the surface has been smoothed by grinding it. Our study shows that there is a non-permanent reduction in thickness and a stiffening per bounce of the probe, indicating a compaction that has not recovered in the millisecond timescale. Additionally, a higher impact velocity has an initial stiffening effect on the paperboard, and this is reduced by smoothing the surface.

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